<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <!-- 生产环境中不建议使用 -->
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
    <title>React 表单</title>
</head>

<body>
    <div id="app">

    </div>
</body>
<script type="text/babel">
        class Guo extends React.Component{
            constructor(props) {
                super(props);
                this.state = {
                    arr:[]
                }
            }

            componentWillMount(){
                //挂载之前获取数据
                console.log('開始获取数据');
                setTimeout(function() {
                    this.setState ={ 
                        arr:['中国']
                    }
                }.bind(this), 1000);
                
            }
            
            
            render(){
                return (<div>
                            <div style={{display: this.state.arr.length > 0 ?'none':'block'}}>暂无数据...</div>
                            <ul>
                                
                            </ul>
                        </div>)
            }
        }
        ReactDOM.render(<Guo/>,app)
    </script>

</html>